Patent US2949580A successfully refreshed from Google Patents.
US2949580A
Expired / Lapsed
US
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Neutralizing circuits
Assignee: Standard Coil Products Co Inc
•
Filing: 1956-07-27
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Granted: 1960-08-16
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Expires: 1976-07-27
Abstract
No abstract record available.
Inventors
- 👤 Robert C A Eland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:48
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/24; H03J5/26; H03J5/30; H03F; H03F1/00; H03F1/08; H03F1/14; H03F1/16; H03J3/00; H03J5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB347402A
Cited
US2235198A
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US2226694A
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US2217408A
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US2247218A
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US2511673A
Cited
US2706798A
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US2751444A
Cited
US2798954A
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US2818472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |